Tomosynthesis Mammography System Depth-Coded Density Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Mammography systems using tomosynthesis face challenges in generating high-quality 3D reconstruction due to limited scanning angles, leading to artifacts and difficulty in representing small microcalcifications indicative of cancerous tissue, necessitating supplementary imaging methods.
Innovation Solution
An imaging tomosynthesis system that generates x-ray projections from multiple angles, reconstructs tomosynthetic slice images, selects characteristic density values, and displays them with correlated color-coded level information, providing enhanced diagnostic visibility by integrating position and density data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If tomosynthesis is used to reduce x-ray dose and eliminate additional recordings, then radiation exposure is reduced, but image quality and diagnostic clarity deteriorate due to limited angular range and artifacts
Solution Approach 1:
The patent introduces a new dimension of information representation by displaying density values with depth coding (e.g., color-coded levels or translucent overlays) on top of the synthetic mammogram. This transforms the conventional 2D image into a multi-dimensional display that encodes 3D spatial information, allowing doctors to perceive depth and layering without acquiring additional 3D data, thus maintaining image quality while using limited angular tomosynthesis data
Solution Approach 2:
The patent creates a virtual copy of the density information from the limited tomosynthesis projections and overlays it on the synthetic mammogram. This virtual copying of depth information through computational methods allows the system to compensate for the limited angular range artifacts by synthesizing depth perception from the available 2D projection data
2Device complexity
If only limited angular range scanning is performed in mammography systems, then device complexity and scanning time are reduced, but reconstruction quality deteriorates due to insufficient projection data
Solution Approach 1:
The patent introduces an intermediary computational layer that processes the limited projection data from the simplified scanning mechanism. By using intermediate synthetic mammograms and depth-coded overlays as mediators, the system bridges the gap between limited input data and high-quality diagnostic output, allowing simple hardware to achieve complex reconstruction quality through sophisticated image processing
3Difficulty of detecting and measuring
If microcalcifications are represented in conventional tomosynthesis, then cancer detection is enabled, but diagnostic clarity deteriorates due to lack of depth perception and overlapping structures
Solution Approach 1:
The patent applies color coding to represent different depth levels of density values. By assigning colors to different z-depth positions of microcalcifications and other structures, the system preserves depth information that would otherwise be lost in conventional 2D displays. This allows doctors to distinguish between overlapping structures and accurately determine the spatial location of microcalcifications relative to other tissues
Solution Approach 2:
The patent adds a visual dimension for depth encoding by displaying density values with depth information through translucent overlays, color-coded levels, or multi-layered composite images. This transforms the conventional 2D display into a multi-dimensional representation that preserves 3D spatial relationships, enabling doctors to perceive the depth and layering of microcalcifications without physical 3D visualization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a clear and diagnostically relevant display of density values, particularly in mammography, by combining maximum intensity projection with depth information, facilitating better interpretation of microcalcifications and potential carcinogenic developments.
Implementation Method 1
X-ray technology has become established as a standard method in medical diagnosis. It is based on the fact that x-rays are attenuated by an object in accordance with the absorption properties of the object.
Implementation Method 2
Methods that also yield information regarding the third dimension have been developed in the course of the further development of x-ray technology. These methods are based on recording x-ray projections from a multiplicity of different projection directions and reconstructing density values of the object, resolved in three dimensions in voxels, from the attenuation data
Data Source
AI summary
An imaging tomosynthesis system, in particular a mammography system, includes a computer system which generates x-ray projections of an examination object from a plurality of projection angles. The system further reconstructs a stack of tomosynthetic slice images, generates at least one overview image of density values of an examination object from the tomosynthetic image data, selects characteristic density values in the stack at at least one plane position, and determines the geometric level of the at least one selected characteristic density value. The overview image is then displayed with a color value correlated to the geometric level of the at least one characteristic density value.